<template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" class="login-form" auto-complete="on" label-position="left">

      <div class="title-container">
        <h3 class="title">后台管理系统</h3>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input ref="username" v-model.trim="loginForm.username" placeholder="用户名" name="username" type="text"
          tabindex="1" auto-complete="on" />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input :key="passwordType" ref="password" v-model="loginForm.password" :type="passwordType" placeholder="密码"
          name="password" tabindex="2" auto-complete="on" />
        <span class="show-pwd" @click="showPwd">
          <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
        </span>
      </el-form-item>

      <el-form-item prop="verCode">
        <span class="svg-container">
          <svg-icon icon-class="vercode" />
        </span>
        <el-input ref="verCode" v-model.trim="loginForm.verCode" placeholder="验证码" name="verCode" tabindex="3"
          auto-complete="on" @keyup.enter.native="handleLogin" />
        <span class="show-ver-code">
          <img id="verCodeImg" :src="verCodeImgSrc" @click="refreshVerCode" alt="单击图片刷新" style="cursor: pointer;" />
        </span>
      </el-form-item>

      <el-button :loading="loading" @click.native.prevent="handleLogin" type="primary"
        style="width:100%;margin-bottom:30px;">登 录</el-button>

      <div class="tips">
        <a @click="handleReg" class="register_user">注册账号</a>
      </div>

    </el-form>
  </div>
</template>

<script>
  import {
    captcha
  } from '@/api/login'

  import {
    validUsername
  } from '@/utils/validate'
  import * as common from '@/utils/base/common'

  export default {
    name: 'Login',
    data() {
      return {
        loginForm: {
          username: 'admin',
          password: '123456',
          clientId: 1,
          verCode: '', // 验证码输入值
          random: '', // 验证码对应的随机数
        },
        loading: false,
        passwordType: 'password',
        redirect: undefined,
        verCodeImgSrc: '', // 验证码图片路径
      }
    },
    mounted() {
      this.initData()
    },
    watch: {
      $route: {
        handler: function(route) {
          this.redirect = route.query && route.query.redirect
        },
        immediate: true
      }
    },
    methods: {
      initData() {
        this.refreshVerCode()
      },

      /**
       * 刷新验证码
       */
      refreshVerCode() {
        // 清空验证码
        this.loginForm.verCode = ''

        // 刷新
        let random = Math.random()
        captcha(random).then(response => {
          if (response.code == 200) {
            // 生成的Base64编码前要加入data:image/jpeg;base64,
            this.verCodeImgSrc = response.data.img
            this.loginForm.random = random;
          } else {
            common.error(this, response.message || '调用接口失败!')
          }
        }).catch(() => {})
      },

      showPwd() {
        if (this.passwordType === 'password') {
          this.passwordType = ''
        } else {
          this.passwordType = 'password'
        }
        this.$nextTick(() => {
          this.$refs.password.focus()
        })
      },

      /**
       * 登录
       */
      handleLogin() {
        this.loading = true
        this.$store.dispatch('user/login', this.loginForm).then(response => {
          if (response.code == 200) {
            this.$router.push({
              path: this.redirect || '/'
            })
          } else {
            common.notify(this, '登录失败', 'error', 2, response.message || '调用接口失败!')
          }
          this.loading = false
        }).catch(() => {
          // 清空验证码
          this.loginForm.verCode = ''
          this.loading = false
        })
      },

      /**
       * 点击注册按钮
       */
      handleReg() {
        this.$router.push({
          path: '/register'
        });
      },

    } // methods end
  }
</script>

<style lang="scss">
  /* 修复input 背景不协调 和光标变色 */
  /* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

  $bg:#283443;
  $light_gray:#fff;
  $cursor: #fff;

  @supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
    .login-container .el-input input {
      color: $cursor;
    }
  }

  /* reset element-ui css */

  .login-container {
    .el-input {
      display: inline-block;
      height: 47px;
      width: 85%;

      input {
        background: transparent;
        border: 0px;
        -webkit-appearance: none;
        border-radius: 0px;
        padding: 12px 5px 12px 15px;
        color: $light_gray;
        height: 47px;
        caret-color: $cursor;

        &:-webkit-autofill {
          box-shadow: 0 0 0px 1000px $bg inset !important;
          -webkit-text-fill-color: $cursor !important;
        }
      }
    }

    .el-form-item {
      border: 1px solid rgba(255, 255, 255, 0.1);
      background: rgba(0, 0, 0, 0.1);
      border-radius: 5px;
      color: #454545;
    }
  }
</style>

<style lang="scss" scoped>
  $bg:#2d3a4b;
  $dark_gray:#889aa4;
  $light_gray:#eee;

  .login-container {
    min-height: 100%;
    width: 100%;
    background-color: $bg;
    overflow: hidden;

    .login-form {
      position: relative;
      width: 520px;
      max-width: 100%;
      padding: 160px 35px 0;
      margin: 0 auto;
      overflow: hidden;
    }

    .tips {
      font-size: 14px;
      color: #fff;
      margin-bottom: 10px;
      text-align: center;

      span {
        &:first-of-type {
          margin-right: 16px;
        }
      }

      a:hover,
      a:focus {
        color: #1481f5;
      }
    }

    .svg-container {
      padding: 6px 5px 6px 15px;
      color: $dark_gray;
      vertical-align: middle;
      width: 30px;
      display: inline-block;
    }

    .title-container {
      position: relative;

      .title {
        font-size: 26px;
        color: $light_gray;
        margin: 0px auto 40px auto;
        text-align: center;
        font-weight: bold;
      }
    }

    .show-pwd {
      position: absolute;
      right: 10px;
      top: 7px;
      font-size: 16px;
      color: $dark_gray;
      cursor: pointer;
      user-select: none;
    }

    .show-ver-code {
      position: absolute;
      right: 10px;
      top: 2px;
    }
  }
</style>
